<template>
  <div :id="id" />
</template>

<script>
// deps for editor
import 'codemirror/lib/codemirror.css'; // codemirror
import 'tui-editor/dist/tui-editor.css'; // editor ui
import 'tui-editor/dist/tui-editor-contents.css'; // editor content

import Editor from 'tui-editor';
import defaultOptions from './default-options';

export default {
  name: 'MarddownEditor',
  props: {
    value: {
      type: String,
      default: '',
    },
    id: {
      type: String,
      required: false,
      default() {
        return 'markdown-editor-' + +new Date() + ((Math.random() * 1000).toFixed(0) + '');
      },
    },
    options: {
      type: Object,
      default() {
        return defaultOptions;
      },
    },
    mode: {
      type: String,
      default: 'markdown',
    },
    height: {
      type: String,
      required: false,
      default: '300px',
    },
    language: {
      type: String,
      required: false,
      default: 'en_US', // https://github.com/nhnent/tui.editor/tree/master/src/js/langs
    },
  },
  data() {
    return {
      editor: null,
    };
  },
  computed: {
    editorOptions() {
      const options = Object.assign({}, defaultOptions, this.options);
      options.initialEditType = this.mode;
      options.height = this.height;
      options.language = this.language;
      return options;
    },
  },
  watch: {
    value(newValue, preValue) {
      if (newValue !== preValue && newValue !== this.editor.getValue()) {
        this.editor.setValue(newValue);
      }
    },
    language(val) {
      this.destroyEditor();
      this.initEditor();
    },
    height(newValue) {
      this.editor.height(newValue);
    },
    mode(newValue) {
      this.editor.changeMode(newValue);
    },
  },
  mounted() {
    this.initEditor();
  },
  destroyed() {
    this.destroyEditor();
  },
  methods: {
    initEditor() {
      this.editor = new Editor({
        el: document.getElementById(this.id),
        ...this.editorOptions,
      });
      if (this.value) {
        this.editor.setValue(this.value);
      }
      this.editor.on('change', () => {
        this.$emit('input', this.editor.getValue());
      });
    },
    destroyEditor() {
      if (!this.editor) {
        return;
      }
      this.editor.off('change');
      this.editor.remove();
    },
    setValue(value) {
      this.editor.setValue(value);
    },
    getValue() {
      return this.editor.getValue();
    },
    setHtml(value) {
      this.editor.setHtml(value);
    },
    getHtml() {
      return this.editor.getHtml();
    },
  },
};
</script>
